Sophora in version 4 is able to use the classic embedded Solr Server along with the Sophora Indexing Service in conjunction with a central SolrCloud. Therefore Sophora version 4 must be used to migrate to SolrCloud.
Starting from the Sophora version 5 only the Sophora Indexing Service is supported. You cannot migrate from the embedded Solr indexer to the Indexing Server using Sophora 5. Thus, we highly recommend migrating before updating to Sophora 5, so that potential problems can be identified and fixed independed from the major Sophora update.
For further details on the migration process, see the documentation for version 4.
